1-(2-Benzoyl-1-phenyl-eth-yl)-4-[(2-hy-droxy-1-naphth-yl)methyl-idene-amino]-3-phenyl-1H-1,2,4-triazole-5(4H)-thione.

In the title mol-ecule, C(34)H(26)N(4)O(2)S, the hy-droxy group is involved in an intra-molecular O-H⋯N hydrogen bond. The naphthyl ring system and the central triazole ring form a dihedral angle of 37.8 (1)°. The crystal packing exhibits weak inter-molecular C-H⋯O and C-H⋯π inter-actions.